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参数资料
| 型号： | R3113D351D-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, DSO3 |
| 封装： | SON1408-3 |
| 文件页数： | 2/18页 |
| 文件大小： | 315K |
| 代理商： | R3113D351D-TR |
R3113D
10
OPERATION
VDD
OUT
GND
Vref
Ra
Rb
Rc
Pch
Nch
Comparator
Figure 1. Block Diagram
tPLH
Supply Voltage
(VDD)
Output Voltage
(VOUT)
Released Voltage(+VDET)
Detector Threshold(-VDET)
Detector Threshold
Hysteresis
12
3
4
5
A
B
Minimum Operating Voltage
GND
Step
1
2
3
4
5
Comparator
Pin Input Voltage
I
II
III
IV
V
Comparator
Output
H
L
Inde-finite
L
H
Tr.1
OFF ON Inde-finite ON OFF
Pch
ON OFF Inde-finite OFF ON
Output
Tr.
Nch
OFF ON Inde-finite ON OFF
Rb
+ Rc
I.
Ra
+ Rb + Rc
× VDD
Rb
II.
Ra
+ Rb
× VDD
Figure 2. Operation Diagram
Step 1. The output voltage is equal to the supply voltage (VDD).
Step 2. At Point “A”, Vref >
= VDD×(Rb+Rc)/(Ra+Rb+Rc) is true, as a result, the output of comparator is reverse,
and output voltage becomes to GND level. The voltage level of Point A means detector threshold voltage,
or (
VDET).
Step 3. When the supply voltage is less than minimum operating voltage, the operation of output transistor
becomes indefinite, and in the case that output is pulled up to VDD, the output voltage equals to VDD
voltage.
Step 4. The output voltage equals to GND level.
Step 5. At Point “B”, Vref >
= VDD×Rb/(Ra+Rb) is true, Output of the comparator is reverse, and output voltage is
equal to the supply voltage, or (VDD). The voltage level of Point B means released voltage, or (
+VDET).
The difference between released voltage and detector threshold voltage is the detector threshold hysteresis.
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